Airplane



FIG. 1 is a front view of an airplane emboding my novel design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side perspective view taken from the front thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a top view thereof.

The broken lines in the drawings are for illustrative purposes only and the plane designation "328" form no part of the claimed design. 

The ornamental design for an airplane, as shown and described. 